30ppi Hamburg Mattenfilter for 10, 15, 20L and 33L gallon tanks

The HMF – What's That? — Seriously Fish

Mattenfilter Shop - SWISSTROPICALS

Matten Filter

DIY Matten filter for aquariums

8.7.3. Hamburg Matten Aquarium Filter

Mattenfilter Shop - SWISSTROPICALS

DIY Matten filter for aquariums

Matten Filter

Foam Type: Poret ® German made quality polyether foam. Hamburg Matten Filter Set. Matten Filters are the best filtration for freshwater shrimp/fish

Poret® Hamburg Matten Bio Sponge Filter Set 31x30x5cm Media shrimp fish Foam HMF

Hamburg Matten Filters are space saving, non leaking and supremely efficient. HMF`s do better when not cleaned.